How to add a channel with session based interface?

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Patrick
Patrick 2013-4-16
I'm trying to get an analog output with my NI-USB-6501 D/A device to control an other device. I've got the Data Acquisition Toolbox with 64bit Matlab R2011a running on Windows 7 .
First I tried to add or connect the device somehow with Matlab:
daqfind
ans =
[]
what were'n very succesfull. Then I tried:
s=daq.createsession('ni')
s=
Data acquisition session using National Instruments hardware:
Will run for 1 second (1000)scans at 1000 scans/second.
No channels have been added.
Next i wanted to add a channel. That's were my problems have started. With the 64bit version i must use the session-based interface, that's propably why this doesn't work
dio=digitalio('nidaq', 'Dev1')
So i tried
s.addAnalogOutputChannel('Dev1','ao2','Voltage')
and
ch=s.addAnalogOutputChannel('Dev1','ao2','Voltage')
but that all doesn't work at all. It answers:
???No appropriate method, property, or field addanalogoutputchannel for class daq.ni.session.
Im not sure wether I used the right deviceID, channelID and measurementType in
s.addAnalogOutputChannel(deviceID, channelID, measurementType)
Thanks in advance! Patrick

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Friedrich
Friedrich 2013-4-23
编辑：Friedrich 2013-4-23
Hi,
it seems more like a programming mistake on your end. MATLAB is Case sensitive. Make sure you use the correct syntax:
>> s.addanalogoutputchannel
No appropriate method, property, or field addanalogoutputchannel for class
daq.ni.Session.
>> s.addAnalogOutputChannel
Adding a channel requires a device ID, a channel ID, and a measurement type.
The first call is most likely what you did (at least thats what the error message you get suggests), which will fail because the method name is wrong.
  1 个评论
Patrick
Patrick 2013-4-23
Now I've got another problem.
s.addAnalogOutputChannel('Dev1','ao1','Voltage')
gives out:
??? There are no CompactDAQ devices available. So I tried to search/find my devices...
If I type in:
daq.getVendors
Matlab answers correctly with informations as ID, FullName, Adaptor Version etc.
But if I try :
daq.getDevices
ans =
No data acquisition devices available
The Matlabs help function wants me to examine my NI MAX. This NI MAX setupt has got a selftesting function which answers postitive. I also can create a task which is working (the device makes click sounds, which I thought would be my aim)
Might it be posible, that USB-6501 is no 'COMPACT' device and the command is only working with such 'COMPACT' devices?
Or might it be, that I'm completely on the wrong way? I thought i can add a channel and after i did that my device would give out the digital signals i want?
Thank you in advance!

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